JPS635461Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a threshing device for a DC combine harvester, and aims to improve threshing performance and prevent straw clogging in the handling chamber.

By the way, in a DC type combine harvester, the entire grain culm transported from the reaping section at the front of the machine is introduced into the handling chamber from the front entrance, and is threshed by passing between the handling barrel and the corn cave in the chamber. At the same time, the structure is such that waste straw is discharged onto the straw walker from the outlet at the rear of the chamber, but in this type of system where the entire grain culm is introduced into the handling chamber, the threshing process within the chamber is effectively carried out. Therefore, there is a tendency for items to be left untreated.

The present invention addresses the above-mentioned shortcomings in the threshing equipment of DC combine harvesters. By supplying the grain, the first threshing process is performed, and the grain culm is rotated upward from the rear of the handling barrel.
The second threshing process is carried out by separating the grains to the left and right sides using a separating guide member installed from the rear to the upper surface of the handling chamber and leading them forward, and then supplying the grains again between both sides of the handling barrel and the corn cave. let it be,
This is intended to improve the threshing performance by reducing the amount of unhandled grain as much as possible.In particular, in the present invention, the tip of the separating guide member at the center of the rear surface of the handling chamber is made into a sharp straw cutting part. This prevents straw clogging at the tip and allows all the grain culms that have undergone the primary threshing process to be smoothly and reliably separated from the center of the handling chamber to the left and right sides for the secondary threshing process. -ing

The present invention will be explained below with reference to the embodiments shown in the drawings. In FIG. , a cutting blade 5, etc. are provided, and 6 is a cross-feeding auger that collects the harvested grain culm in the center of the machine body, and 7 is an entrance provided in the front center of the handling chamber 9 of the threshing device 8. 9a
This is a vertical conveyor that carries in from. Reference numeral 10 denotes a handling cylinder mounted on an axis in the handling chamber 9, 11 a cone cave arranged along the lower surface of the handling cylinder, and 12, 12 an outlet 9b provided on both left and right sides of the rear surface of the handling chamber.
This is a beater for discharging straw provided in b. Reference numeral 13 denotes a swing sorting section at the rear of the threshing device 8, which includes a straw walker 14 extending from below the outlet of the handling room to the rear of the machine, and a chaff sheave 1 disposed below the straw walker 14.
5. It is composed of a grain sieve 16 and a grain 17 that generates a sorting wind, and the sorted grains are stored in a grain tank 1 at the bottom of the oscillating sorting section.
8, and a second screw conveyor 20 that returns second items that need to be reprocessed to the handling room or processing room (not shown).
is installed. However, in the above-mentioned threshing device 8, as shown enlarged in FIGS. 2 and 3, the rear central part of the handling chamber 9 follows the rear end of the corn cave 11 and forms a guide surface that rotates upward around the handling cylinder 10. 9c, and a cross-sectional separation guide member 21 whose width gradually increases along the periphery of the handling cylinder is provided from the center of the rear surface of the handling chamber to the upper surface,
Further, the tip of the member at the center of the rear surface of the handling chamber is formed into an acute-angled straw-cutting portion 21a. here,
The straw cutting portion may be formed by fixing a separate member to the guide member 21 as shown in the figure, but it may also be formed by forming the tip of the member 21 itself into a sharp shape.

According to the above configuration, the grain culm harvested in the reaping section 2 at the front of the machine is carried into the handling chamber 9 of the threshing device 8 from the entrance 9a at the center of the front by the horizontal feed auger 6 and the vertical feed conveyor 7, By being supplied between the lower center of the handling barrel 10 and the corn cave 11, the primary threshing process is performed in the center of both. The grain culms that have undergone this primary threshing process are sent out to the rear of the handling drum 10, and the center of the rear surface of the handling chamber 9 serves as a guide surface 9c that moves upward along the periphery of the handling drum. Therefore, the grain culm is rotated further forward from above by the rotation of the handling barrel, and during that time, it is separated into left and right sides by a separation guide member 21 provided from the rear surface to the upper surface of the handling chamber. The kernels are again fed between the handling barrel 10 and the corncave 11 on both sides of the handling chamber, and a second threshing process is performed on both sides, so that the grain is almost completely separated from the grain culm. At the same time, the threshed waste straw is discharged onto the straw walker 14 from the outlets 9b, 9b on both sides of the rear surface of the handling chamber.
In this case, the tip of the separation guide member 21 at the center of the rear surface of the handling chamber is formed into an acute-angled straw-cutting portion 21a, so that when the separation guide member 21 is rotated upward from the rear in the center of the handling barrel, the tip Grain culms caught in the tip are pressed and cut by subsequent grain culms that try to move upward one after another, and this prevents straw clogging due to grain culms remaining caught in the tip. Thus, all the grain culms that have undergone the primary threshing process are smoothly and reliably separated into both sides of the expanded chamber. In the illustrated embodiment, the inclination angle α of the side surfaces 21b, 21b that separate the grain culms from side to side in the separation guide member 21 is large at the tip of the rear surface of the handling chamber, and gradually becomes smaller as it moves toward the upper surface. There is.

As described above, the present invention provides a threshing device for a DC combine harvester in which a handling barrel is mounted on a shaft inside the handling chamber and a corn cave is arranged below the handling barrel. An entrance is provided through which the harvested grain culm is carried in through the horizontal feed auger and the vertical feed conveyor, and furthermore, there are provided exits on both left and right sides of the rear surface that overlook the starting ends of the straw walkers in the swing sorting section. At the same time, the central part of the rear surface of the chamber is used as a guide surface for causing the grain culm passed from the entrance to the lower central part of the handling barrel to circulate upward;
In addition, a grain culm separation guide member is provided that gradually becomes wider from the center to the upper surface of the rear surface of the chamber, and the tip of the member is configured to have an acute-angled straw cutting portion, so that grains can be fed to the handling chamber. The grain culms are threshed twice in the first and second stages by the central and side parts of the handling barrel in the chamber, and as a result, the grains are threshed without leaving any residue. The grain culm is almost completely separated from the grain culm, improving threshing performance. In particular, the straw cutting part provided at the tip of the separation guide member also cuts off the grain culm caught in the tip. This will ensure that the grains are separated into left and right sides, thereby preventing straw clogging in the handling room, and ensuring that all the grain culms are subjected to the above-mentioned primary and secondary threshing processes smoothly and reliably. be.

[Brief explanation of the drawing]

Fig. 1 is an overall vertical cross-sectional side view of the main parts of a combine harvester showing an embodiment of the present invention, Fig. 2 is an enlarged longitudinal cross-sectional side view of the threshing device in the embodiment, and Fig. 3 is a longitudinal cross-section taken along the line shown in Fig. 2. It is a front view. 8... Threshing device, 9... Handling room, 9a... Entrance,
9b...exit, 9c...guide surface, 10...handling cylinder,
11... Corn cave, 21... Separation guide member,
21a... Straw cutting part.

Claims (1)

[Scope of utility model registration request] At the center of the front of the handling room, in which the handling drum is mounted on a shaft and a corn cave is arranged below the handling drum, there is an entrance through which the harvested grain culm is carried in from the front reaping section through the horizontal feed auger and the vertical feed conveyor. At the left and right sides of the rear face of the chamber, there are provided outlets facing downwardly the starting ends of the straw walkers in the swing sorting section, while the central part of the rear face of the chamber is connected to the rear end of the cone cave. A grain culm separation guide member is provided, which uses the periphery of the handling drum as a guide surface that turns upward, and whose width gradually increases along the periphery of the handling drum from the center of the rear surface of the chamber to the upper surface. A threshing device for a direct current combine harvester, characterized in that the tip at the center of the rear surface of the handling chamber is an acute straw cutting section.